1

I am in manual mode (M on the top left scroll wheel above the on button) using a sigma 10-20mm F4-5.6 and then I spin the scroll wheel (which has a "set" button in the middle) below the 'q' button, the aperture doesn't change.

It also won't change in Aperture priority mode (AV Mode)

I am a noob with cameras, so I am really stumped

  • 2
    Have you checked the control wheel isnt "locked" (the button underneath saying "unlock") – Digital Lightcraft Jul 31 '15 at 10:24
  • Great, i have made an answer below, it would be great if you could mark it as correct :-) – Digital Lightcraft Jul 31 '15 at 10:27
5

It sounds like your control wheel is "locked" - press the button underneath it called "unlock" This should now let you control the aperture.

2

Digital Lightcraft gave the correct answer but I'd like to add that you can disable the automatic locking from the menu - the fourth tab from the right, lowest item ("Lock" and a wheel icon).

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